Manufacture of footwear.



PATENTED JUNE 19, 1906.

M. d; CLARK. MANUFACTURE OF FOOTWEAR.

Q vi bneoaco Noi 823,926. PATENTED JUNE 19, 1906.

- M. c. CLARK.

MANUFACTURE OF FOOTWEAR.

APPLIUATION FILED MAB..29, 1905.

5'SHEBTS-SHEET a.

PATENTED JUNE 19, 1906;

M. G. CLARK. MANUFACTURE OF FOOTWEAR.

APPLICATION FILED MAR. 29.. 1905.

5 SHEETS-SHEET 5. I 7

. and useful Improvement in the Manufacture UNITED STATES PATENT OFFICE. A

MAURICE O. CLARK, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO MARVEL RUBBER COMPANY, A CORPORATION OF RHODE ISLAND.

MANUFACTURE OF FOOTWEAR- .Patented. June 19, 1906.

Application filed March 29,1905. Saris-11.1110. 252.666.

To all whim tit may concern.-

Be it known that I, MAURICE (3. CLARK, a citizen of the United States, and a resident of Providence, county of Providence, and State of Rhode Island, have invented a certain new of Footwear, of which the following is a specification.

In the accompanying drawings, Figure 1 is a side elevation of a machine embodying my invention. Fig. 2 is a front elevation of the same. Fig. 3 is a rear'elevation of the same. Fig. 4 is a longitudinal section through the steam-chambers and the apparatus by which the moldsare opened and closed, showing the parts opened. Fig. 5 is a vertical longitudinal sectional view of a portion of the lastsupporting stud. Fig. 6 1s a view in side elevat1on of 'a modified form of my invention,

and Fig. 7 is a detail sectional viewof a form of valve used in connection with the hydraulic motor. Fig. 8 is a detail view, partly in elevation and partly in section, of the last-sup port shown in Fig. 5, such view illustrating 5 the manner of connecting the head 61 with the sleeve 62. 1

.1 is a last conforming to the ordinary rubber overshoe. 2 and 3 are the side-mold arts, and 4 is the sole-mold art, of a conormation adapted to mold t e exterior of such shoe. 5 and 6 are the steam-chambers for imparting vulcanizing heat to said side-' mold parts, and 7 is a steam-chamber for said sole-mold part. These steam-chambers are provided with the necessary steam-fittings for the circulation of steam and which may be of any suitable construction and are not shown.

The side-mold parts 2 and 3 and their steam-chambers 5 and 6 are su ported and operated as follows: The base-p ate 7 a of the frame is provided with the side. uprights 8 and 9. 10 and 11 are a pair of bars shdably mounted in said frame-uprights and extending longitudinally from end to end of the ma-. chine. The side-mold part Zand its steamchest 5 are rigidly fixed across the front ends of said pair ofbars by the nuts 12 and 13. The side mold 3 and its steam-chest 6 are slidably mounted upon said pair of bars by being provided at opposite ends with the lugs 14, bearing upon said bars above and below. The 'rear ends of said pair of bars are E screw-threaded and carry the cross-head 15,

which is held adjustably at each end between the side mold 3.

'24 and 25.

'wellas one for the slide 30. the members of a vertical guide way su the pair of nuts 16 16 on one bar and the air of nuts 1717 on the other bar. 18 is a p' lar erected upon the frame-base 7 a and in which of one of these toggle-joints is delivered di-' rectly against the back of the side mold 3 and its steam-chest 6. The thrust of the other of the toggle-joints is delivered to the side mold 2 and itssteam-chest 5 indirectly through the cross-head and the twoside bars 10 and 11. Thus the operation of the rocker member 20 causes the twoside molds and their steam-chests to reciprocate inversely toward and from the last in unison. Their relative position may be adj usted by means of adj ust ing the cross-head 15 upon the two rods by means of the pairs of nuts 16 16 and 17 1 7.

The sole-mold 4 and its steam-chamber 7 are supported and guided as follows: Ontop of the u rights 8 and 9 of the mold-frame is mounted v the side uprig ts 24 25, connected bythe stretcher-bolt 26. 27 ande 28 are trunnions cast or otherwise secured to 'theback of the steam-chest 7, which trunnionshave their bearings in hangers 29 and 30,'mounted to" slide vertically between lu s 31, cast" on the inside of the supplementa frame members 32 is a steam-pipe extending throu h the slot 33 in the frame to enter the end 0 the trunnion for the supply of steam to the steam-chest 7. 34 is a pawl engag ng with a notch in the slide 30, into which notch it is pressed by the spring 35. The free end of-this pawl is provided with a pin 36. There a sup lementalframe consisting of are two of these pawls, one for the slide 29, as

37 and 38 are ported by the supplemental frame in en stantial alinement with the center of the last. 39 and 40 are two arms fixed tothe top of the steam-chest 7, so' as to extend therefrom vertically upward when the mold part 4 is in pressiiig position, as shown in Fig. 1. Upon the outside of these arms, respectively, are

lugs 41 and 42, which cooperate with the guidewa s 37 38 in such manner as to compel the rst movement of the mold part 4 to be in a vertical line. The guide members 37 are, however, cut away, so as to leave the opening 43, permitting the lugs 41 and 42 to leave said guideways after having ascended therein a short distance, and thus to permit the steam-chest 7 and mold part 4 to be turned upwardly and rearwardly upon the trunnions.

The sole-mold part 4 and its steam-chest 7 are actuated as follows: 44 is a double-acting hydraulic motor mounted upon the supplemental frame, the cross-head 45 of which slides horizontally in guideways 46 and 47 on the supplemental frame. This cross-head is connected with the top of the steam-chest 7 by the links 48, pivoted to the cross-head by the shaft 49 and to the steam-chest by the shaft 50. When now the mold part 4 is in the pressing position, (shown in Fig. 1,) the first effect of the reversal of the hydraulic motor 44 will be to raise it vertically upward by reason of the engagement of the lugs 41 and 42 with the guideway members 37 and 38; but the second effect upon reaching the top of the guideway 37 will be to swing it upon its trunnions into a vertical position. In Fig. 4 it is shown in the act of being so swung and in about midway position. During the first or upward motion the slides 29 and 30 will be drawn upward until the pawls 34 engage with their notches, and they remain in such engagement during the swinging movement, so as to support said slides and the trunnions suspended thereby. Upon the return movement of the hydraulic motor these slides and trunnions are held in their elevated position by said pawls until the end of the return swinging movement is nearly reached, whereupon the pawls will be knocked out of engagement with their notches by the collision of the lugs 51 with the pins 36 on said pawls. This disen agement. of the pawls is so timed that t .e descent of the slides 29' and 30 will not occur until after the lugs 41 and 42 have passed into the guideways 37 38, ready for the vertical motion which returns the mold to pressing position. The lugs 51 are pivotally secured to the crosshead 45 and held normally in the position shown in Fi 4 by a suitable spring, (not shown,) so that in the opening of the mold they can yield so as to pass by the pins 36 on the gawls.

T e toggles for operating the side molds may be actuated as follows: 52 is a rockin arm. pivoted to the supplemental frame carrying at its free end a fork, one branch of which, 53, is lon er than the other branch Engaging with t .'s fork is a pin 55, fixed to a hanger 56 from the cross-head 45. The rocking arm 52 is connected with the long rocker, arm 23 by the link 53*. Thus whenever the motor 44 raises the mold part 4 it will, through the connections last described, cause the toggle mechanism to open the side molds 2 and 3 in unison therewith, and vice versa, on closing.

I will next describe the movement imparted to the last 1. Heretofore in the endeavor to manufacture molded footwear an obstacle to success has been the tendency of those mold parts whereby the upper of the boot or shoe was formed (which I will refer to as the upper-forming mold parts and which in the form shown in the accompanying drawings are designated as 2 and 8) in closing to gather between them a wrinkle of the upper inclusive of the rubber and linin and thus destroy the product for commercirlpurposes. I propose to overcome this difficulty by holding back those portions of the last-surface which support the 'upper adjacent to the line of separation between the up )er-forming mold parts until the closing of the up ier-forming mold parts is substantially completed (or, in other words, so far completed as not to gather the upper between them) and then to advance said last-surface portions into final molding position by a last-surface-locating means which may be of the form hereinafter described or of any other suitable form. The last-surface-locating means which I am about to describe locates the whole of the laid-surface, inclusive, of the surface lasting the sole, as well as the surface lasting the upper; but for the purpose of that part of my invention to which reference is now being made the part of the last-surface of which the movement is essential is the upper-lasting pa rt, and particularly those portlons thereof that last the upper adjacent to the line of division between the upper-forming mold parts wherever said line of division may be located.

Referring articularly to Figs. 5 and 8, it will be noterF that 57 is a vertical stud containing the longitudinal perforation 58, and upon the upper end of which stud is screwed the last 1, consisting of a shell of cast metal containing the side perforations 59 to permit the outflow of air from the interior to the exterior cf the last. The stud 57 is mounted to I'CO reciprocate in a vertical bearing 60 and at its 5 lower end is provided with a head 61. G2 is a tubular sleeve the up )er end of which is slotted, as at 62, to admlt of the head 61 being inserted laterallv therein, so that the passageway 58 may ahne with the air-channel 53, in which lies the fluted stem of the airvalve 58 The air channei 58 and the valve 58 lie within the housing 71 whiehis connected at 7t to the movable post It". The valve 58 is tensioned by the spring 59, while-the housing It, movable with the post 74 is tensioned by the s )ring 58". Air is admitted from any suitable source under pressure to the air- )ipe 58 which leads into the chamber 53 he air-valve 58 controls commu Fig. 5, t

nication between the chamber 58 and the When it is desired to permit channel 58. air to flow into the hollow last, the hand-lever 58 carrying the cam 58.is operated, which cam bearing against the bottom of the slid ing post k forces the latter upwardagainst the tension of the spring 58 until the top of the housing abuts against the head 61, when, of course', owing to the'upward movement of the housingh away from the head of the valve 58?, communication will be'established between the air-line 58 and the interior of the last. When the lever 58 i is moved to its normally inoperative. osition, (shown in Fig. 4,) the toe of the cam ein moved awayfrom the base of the post it of t e housing will-permit the parts to assume the position shown in munication between the parts. sleeve 62 is also provided with side lugs 63, mounted to slide longitudinally in the carriages 64, which slide vertically in. the hanger 65 from the main frame. A hand bell-crank lever containing the arms 66 and 67 is fulcrumed at the end of its short arm to the links 68, pivoted to the main frame. Said slide 63 1s pivotally secured to said handlever, so as to be raised and lowered thereby.

' Thus by the movement of the hand-lever 66 the slide 63 and the stud 57 will be recipro-' cated vertically, forming means whereby the last may be raised and lowered.

The operation of the whole machine will be as followsrsu posing the molds to be entirely opened, t e operator takes a shoe which is upon the last'l, carrying the stud 57, and operates the lever 58 so as. to operate the air-valve in the manner hereinbefore described to permit air to flow from a suitable source (not shown) through the pipe 58 into the hollow last. .The shoe in this position is held a very short distance above the position to be occupied during vulcanization, and

when the top or sole mold bears down upon the last 1 it will have a tendency to force the head 61 slightly downward toward the shelf 70. As-heretoforementioned, the molds are operated by themotor 44. The hydraulic motor 44 is started to close the molds, and its operation will be to close the side molds before it completely closes the sole-mold 4. As soon as the operator sees that the side molds are closed and before .the sole-mold-is completely closed he will pull the lever 66 toward him, so as to very quickly engage the slide 67 with the head of stud 57. He will then immediately by a downward movement of the lever 66 depress the last and its shoe between the side molds to its final position. By this depression the materialof the shoe betweenthe sides of the last and the side mold is strongly compressed. The.con verging form of the last and the side molds by which this compression is produced extends all the way down to the border oimare head of the valve 58 closing eom The-tubular gin of the inverted shoe, so that, if desired,

the form of the margin of the shoe may be molded by'this pressure. The movements by which the operator is enabled to depress the shoe into its final position are such that it can be done almost instantaneously, as is necessary in order to enable it to be done after the side molds arein osition for pressing and while the sole-moi is arriving at its final position. After the operator has thus depressed thelast to its final position the hydraulic motor will continue its closing operation until the sole-mold 4 is brought into pressing position. Thereupon the parts will remain in pressing position until the vulcanization is complete.

In Fig. 6 I have shown another form of my invention differing from the machine just described, principally with regard to the manner of operating the toggles of the side molds and the top mold. In the construc tion shown in Fig. 6, 25 designates a bar u on which is mounted to slide the sleeveb ock 52*, having a small lug 52 projecting upward therefrom. Operatively connecting this sleeveblook with the arm 23 is a link 56". Carried by the outer end of the piston 44 of the hydraulic motor is a cross-head 56,

designed to slide with the moyement of such piston and connected to the top of the st eamchest 7 by the before-mentioned link 48. This cross-head is provided with a rigid lug 55" and a pivoted dog 53*. 56' is a stop-pin to limit theforward movement of the upper end of the dog, and 53 is a projection pivoted to the side of one of the guideways of the cross-head and depending downward in the path of movement of the double dog 53*.

The projection 53 is prevented from swinging forward toward the front of the machine by the stop 53 7 The operation of thisconstruction is as follows: In the position shown in Fig. 6 the piston has completed its forward movement and the top mold 4 is pressing against the sole of the article. Now if the parts are to be retracted to the position shown in Fig. 4

air is admitted to the front end of the piston through pipe 75 and the mold 4 is drawn vertically upward, being maintained in :a vertical pathway by the guides heretofore described. When the lugsleave the guides ,37and the piston is in its retractive movement, the cross head willbe drawn backward. The end 53 of the dog striking the lug 52 on the sleeve-block and yielding willpass the same; but the lugfl55 willengage with the lug 52 and pulling the same along the bar 25 will rock the arm 23 toward the'rear of the machine, and consequently cause the side molds to move in opposite directions away from each other in the manner heretofore described until the piston has reached the limit of its rearward movement and the mold 4 is. elevated. Now in the downward nels 80, adapted to aline wit travel of the top mold and the closing in of the side molds the action is as follows: The sleeve-block is in position near the rear of the bar 25", and its lug 52 is engaged bythe toe 53" of the dog, which carries it forward until the projection 53 trips the dog and disengages it from the sleeve-block, the side molds at this point having closed in on the shoe. The piston continues its forward movement to the end of its throw, and the mold 4 is brought into contact with the sole of the shoe a short time after the side'molds. To actuate the piston of the motor by conveying hydraulic pressure to and from the cylinder, I employ the following preferred construction: 72 is a four-Way valve having four connecting-pipes 73, 74, 75, and 76, the pipes 74 and 75 leading into the rear and front ends, respectively. 79 is a lever connected to the stem 78 of the conical valve-head 77, which latter is formed with se mental chanthe various openings 81, formed in the conical valve-seat 82. By turning the stem by means of the lever the pressure may be admitted through the intake-pipe 7'3 to the valve and from thence to either side ofth'e piston, it being understood that as it is admitted to one side of the piston it is exhausted from the other and escapes through the valve and out of the exhaust-pipe 76. It will of course be understood that any type of valve may be employed and any means for operating such valves at the proper time may also be used.

What I claim is 1. The combination of a last, side molds, a top mold, and actuatin means for said molds adapted to bring t e side molds into contact with a shoe on the last at a relatively earlier time than the top mold.

2. The combination of a last, and a plurality of mold members, certain of which are movable into contact with a shoe on the last prior-t0 certain other of the mold members.

3. The combination of a shoe-support, a plurality of oppositely-moving side molds, a top mold, means for actuating said top mold in driving or operating connection therewith, and power-transmitting means between the top mold and the side mold and operated by the movement of the means for actuating the top mold.

4. The combination of a shoe-support, a plurality of molds arranged adjacent to the support, and means for bringing certain of said molds into contact with the shoe on the support prior to certain other of the molds.

5. The combination with a last, a top or sole mold and side molds, means connected directly with and actuating the top mold, and power-transmitting means between the top mold and the side molds.

6. The combination of a last, atop or sole mold and side molds, a motorin direct driving engagement with the top mold for actuating the latter and a rocking power-transmitter between the top mold and the side molds, whereby the side molds are actuated from the motor driving the top mold.

7. The combination of a shoe-support, a mold therefor, mechanism for actuating said mold, means for directing the movement of said mold in approximately vertical plane a portion of its distance, and means for permitting said mold to rock or swing from said vertical plane.

8. The combination of a shoe-support, a mold, a motor for actuating said mold, means for directing said mold in its movement in an approximately vertical plane for a portion of the distance, and means for causing said mold to rock or swing from said vertical plane.

9. In combination with a shoe-molding machine of a top or sole mold therefor, a motor, a movable connection between said motor and the mold, and means for rocking said mold at the point where it is secured to the connection.

10. In combination with a shoe-molding machine, a top mold, a side mold, a motor, a connection between said motor and the top mold, and power transmitting mechanism interposed between the motor and the side mold, and adapted to be actuated by the movement of the motor to impart a reciprocating movement to said side mold.

11. The combination with a shoe-support, of a plurality of side molds, a motor, a top mold actuated directly by said motor and a rocking connection interposed between the motor and the side molds and adapted to be actuated by the movement of the motor for imparting a reciprocating motion to each of said molds to move the same toward and from each other.

12. The combination with a shoe-molding machine of an adjustable shoe-support, a top mold, a plurality of side molds, one arranged at each side of the shoe-support, a motor, a connection between the motor and the top mold, and mechanism movably mounted on the frame of the machine adapted to receive motion from the movement of the motor for moving the side molds toward and from each other.

13. The combination with a shoe-molding machine, of a shoe-support, a plurality of oppositely-disposed sliding side molds, a vertically-movable top mold, a hydraulic motor connected to said top mold for operating the same, and power-transmitting mechanism including a rocker-arm interposed between the motor and the side molds for transmitting movement to said side molds from the motor, whereby the side molds are closed at a relatively earlier period than the top mold.

14. The combination of a shoe-support, a top mold and side molds, a motor connected to and actuating said top mold, a rocking arm, and connections between said rocking m, a connection rocklng arm and the motor, for transmitting motion to said side molds simultaneously with the movement of the top mold.

15. The combination of a shoe-support, mechanism for moving said support vertically, means for shifting the support laterally, and a plurality of molds arranged adj acent to said support and adapted to be closed about said support.

. 16. The combination of an adjustable shoe-support, heated pressure-producing de.

yices adapted to bear against a shoe uponthe support, and means for moving certain of said evices into contact with said shoe at relagtively diflerent times.

r j 17. The combination of a shoe-'su port, jheated pressure-producing devicesadapted ;-to bear against a shoe upon the support,

26 {means for moving one of said devices in an approximately vertical path and then rockgmg such device out of sald vertical path, and

means for causing certain other of the devices to move toward and from the shoe in an ap proximately horizontal plane.

5 18. The combination of an adjustable shoesu port, heated pressure- I a apted to bear against a s oe upon said support,- means for moving certain of said de- 30 vices.

19. The combination of a shoe-support, a plurality of oppositely-moving molds, a motor, a rocking sole-mold actuated by said motor, a toggle mechanism, and means for transrnitting power from movmg rolls. k

20. The combination of a shoe-support, a a plurality of molds adaptedto be moved toward and from said shoe-support, a rockerbetween said rocker-arm and said molds, a motor, 'a rocking sole-mold connected. to the motor, and fneans for imparting motion from the motor to the togglearm and thence through the connections to said molds.

21. The combination of a shoe-support, a plurality of sliding side molds, a rocking sole or top mold, a motor, a connection between the motor and top mold for actuatingthe latter, toggle mechanism connected to the side molds, and means for imparting motion from the motor through the to gle connection to the side molds to actuate the latter.

22. The combination of a shoe-su plurality of side molds, a top mol a hydraulic motor connected to. the top mold, means for transmitting motion from said mo port, a

tor to the side molds to move the latter in opposite directions, means for introducin an operating fluid to the motor, and a valve for controlling said fluid-introducing means.

roducing devices vices toward and from each other and toward and 'from the shoe, and means for ele. vatmg and rocking certain otherof the de-- the motor through the toggle mechanism to actuatesaid oppositely 'moving therein, a connection between one of chamber, induction-pipes i 23. The combination of a shoe-support, a

lurality of hollow side molds adapted to be a eated, a top mold also adapted to be heated,

a hydraulic motor having a piston'connected to the top mold, toggle mechanism interposed between the motor and connected to the side -molds, means actuated by the'movement of the iston for imparting motion to the toggle mec anism to move said side molds, and means for introducing an operating fluid to the motor. I

v24. The combination of a. vertically and laterally adjustable shoe-support, a top mold, a motor comprising a casing and a piston moving therein, means for introducing an operating fluid to the motor, a link connection between the piston and the mold, means for guiding said mold in a vertical path in its movement, and means for swinging said mold out of said vertical path, at a c'ertain'period of its movement. I

'25. The combination with a shoe-molding machine, of a hollow shoe-support, adapted to have a pressure fluid introduced thereto, means for controlling the admission of the pressure fluid to and from the support, means'for moving said support vertically, and means for shifting said support laterally.

26. The combination with a shoe-moldin machine, of a hollow shoe-support adapted to have a pressure fluid introduced thereto, .valvemechanism for controllin the introduction of such fluid-pressure, a s iding frame for movin said support vertically, and means for s ting said sup ort laterally.

27. The combination of a shoe-support, a plurality of pressure-producing devices adapted to be moved into and out of'contact with a shoe upon said support, a hydraulic motor comprising a cylinder and a piston sald' pressure-producing devices and the piston, and means for introducing an operating fluid to the cylinder comprising a valve-'- chamber, a supply-pipe leading into said leading from said chamber to opposite ends of the cylinder, an exhaust-pi e leading from said valve-chamher, and a our-way valve within the chamber.

28. The combination of a hollow, adjustable shoe support, a plurality of molds each provided with a heating-chamber, a hydraulic motor for actuating all of said molds,

and means for bringing certain of said molds into contact with a shoe upon the support at I 2 relatively earlier times than certain other of 'said molds.

29. In a shoe-molding machine the combination of a shoe-support, and a rocking sole-mold adapted to be moved into and out of contact with the shoe on the support.

30. In a machine for molding footwear, in

combination, a plurality of upper-forming mold parts, an upper-forming last-surface and means whereby those portions of said 1 c IIO last-surface lasting the upper adj acent to the line of division between said mold advanced after the substantial closing of said mold parts.

31. In a machine for molding footwear, in combination, a plurality of upper-forming mold parts, an upper-forming ast-surface complemental thereto, a rest whereby said last-surface is supported to withhold the up- I per from the line of separation between said i mold parts while the same are closing, means for closing said mold parts and alast-surfacelocating means whereby those portions of the last-surface adjacent to the line of division between said mold parts are advanced.

32. The combination with a frame and a shoe-last, of a plurality of molds, means for closing certain of said molds about a shoe on the last at a relatively earlier period than certain other of the molds, and means for I checking the movement of the molds first closed while the movement of the mold mem ber last in closing is continued.

33. The combination with a rigid last-surface, of a plurality of oppositely-movin mold members, means for bringing said mol members to a stationary, closed position adjacent. to the last, and means acting upon the last for advancing the same to its nal position within the closed mold members.

34. In a machine of the class described the combination with the frame and a shoe-support thereon, of'a' sole-mold, and means for imparting movement to the sole-mold, such means comprising a sliding member, and means connected to the sole-mold and actuated by the sliding member.

35. The combination with the frame and the shoe-support thereon, a motor, asole-mold, amember connected to the sole-mold and actuated by the motor, a second member arranged adjacent to the first member, and connected.to the side molds, and means for transmitting power from the first to'the second member whereby all of said molds may be actuated.

36. The combination with the frame and the work-support thereon, of side molds and the'sole-mold, a motor, power-transmission parts are from means between the motor and all of the molds whereby said molds may be operated the motor, and means for checking the movement of the side molds and permitting the continuation of movement of the sole mold after the movement of the side molds has ceased.

37. The combination with the frame and the work-support thereon, of side molds and a sole-mold, means for actuating all of said molds simultaneously, and means for checking the movement of the side molds while the movement of the sole-mold continues.

38. In combination, rigid mold parts, a rigid last-surface part, means whereby the mold parts are advanced, means whereby a portion of the surface of the last opposed to said mold parts is held back from final position during the closing of the mold parts, and means whereby said portion of the last-surface is given its final advance toward said mold parts after the closing of 'the mold parts. I

39. The combination with the side molds, of a rigid-surface shoe-support held out of final position when the side molds are closed, and means for moving the support into final position toward the side molds.

40. The combination with a mold member, of a rigid shoe-support held out of contact with the mold member when the latter is stationary and in its closed position, and means for advanein the shoe-support into contact and into fina position relative to the mold member.

41. The combination with the side molds, of a last composed of inflexible material interposed between the same and held out of "final molding position when the side molds are closed, and means for applying pressure to the last to advance the same toward and into final molding position relative to the closed molds. I

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MAURICE C. CLARK.

Witnesses:

RICHARD B. CAVANAGH, CHAs. J. RATHJEN. 

